Im getting destroyed because of religion and Im only 19

Im getting mentally destroyed

Hello, Im a 19 years old woman and Im so lost. For context I am since 3 months in a good romantic relationship, everything is going well with him and I think he is the one for me.

I never been treated this good by someone, he is nice, gentle, beautiful, respectful, he listens to me when I need it, he helps me but one thing is I am a Muslim and he is a Christian and this is what is getting me mentally destroyed because I just cant stop thinking "what if Im not allowed to marry a christian I will make haram ( =not permissible) things with him once we marry I talked to him about it he said I will practice my religion as I want when we will live together so Im thinking "but what if Allah hates me anf make me go to hell even if I dont quit my religion after our marriage, what if he dont consider our marriage valid"

why cant I just be happy with my relationship that is perfect. I love him so much, I could kill myself if we leave each other for that. Im just sick of being anxious because of that. I dont properlly enjoy our time together anymore becaude Im always thinking about this. I just want to stop overthinking, he is not overthinking or being anxious but me I am so much. And yes I tried talking about it many times and he would try to reassure me but it doesnt take a long time for me to get anxious again

I think Im getting crazy I thought about crazy things And he said he want to stay a Christian and when we debated about it I had a big crisis and almost went to the hospital because of an anxiety attack because he told me he was never gonna be a muslim Im trying to learn more about religions but I cant decide anything and at this point of time I think I dont know what is the true one now 😭

I began to overthink about death, I think about death 24/7 about how hard I will be punished for my sins about the fact that God surely hates me, I dont enjoy anything now Im so damn overwhelmed

Please help, Im suffering from suicidal thoughts Please help me